<#macro randomCode>
<script type="text/javascript">   
    function changeValidateCode() {   
        var timenow = new Date().getTime();      
        $("#randImg").attr("src","${base}/random!execute?id="+timenow);   
    }   
</script>  
		<a href="javascript:changeValidateCode()" hidefocus title="换一张">
			<img id="randImg" src="${base}/random!execute"  border="0" style="vertical-align:middle" />
		</a>&nbsp;
</#macro>